A young man who claims Michael Jackson molested him in the early 1990s continued his testimony on Tuesday, with his mother also taking the stand to deliver yet another bombshell -- that she'd witnessed the singer taking a shower with pop choreographer Wade Robson when he was a young boy.

Blanca Francia, a former housekeeper who worked for five years at Neverland Ranch and Jackson's other homes, testified that while she never saw any evidence of molestation involving her son, she became worried about him once she started witnessing inappropriate behavior involving Jackson and other young boys.

When Macaulay Culkin (whom she called "the little kid from the movies") visited Neverland, she said, he sometimes came without his family members and stayed in the singer's bedroom. And when Robson visited, he also stayed in Jackson's bedroom, she said, recalling one incident in which she allegedly witnessed Jackson in the shower with him when the boy was about 8 or 9.

She said she used a key to enter Jackson's bedroom to clean it and heard laughter. "First I thought they were playing in the bathtub or the Jacuzzi ... and I walked in, I peek in, and they were in the shower," she said. She saw their underwear on the floor outside the shower and immediately left without saying anything. Jackson's defense team quizzed her about how she could have seen anything if the shower door were steamed up, and she said she was sure she saw "Mr. Jackson and the little kid."

Robson was interviewed by inspectors during the 1993 investigation of the singer, and most recently told Australian reporters in November 2003 that "nothing strange happened" (see [article id="1495535"]"Macaulay Culkin, Corey Feldman To Testify In Jackson Case?"[/article]).

Because of the alleged shower incident, Francia said, when she saw her son sitting on the singer's lap at the Jackson family home in Encino, she ordered him to get off, even though he said he was fine. She also said her son told her about the $100 bills the singer gave him for their bouts of "tickling" games, which later allegedly escalated to fondling, but that her son told her Jackson put the money in his pocket, not down his pants (see [article id="1499556"]"Witness Says Jackson Would Tickle Him, Give Him $100 Bills"[/article]). They later settled with the singer for $2.4 million in 1994 (see [article id="1490772"]"Michael Jackson Admits He Paid Off Accuser"[/article]).

When her son continued his testimony Tuesday, he had a hard time remembering recent details about the matter, such as who was present or what was said when he talked to authorities. He hadn't told anyone about the alleged tickling/fondling incidents until 1993, he said, when investigators questioned him about a separate case. Detectives followed up with him in 1994 and in 2004. Under cross-examination, he conceded that in his 1993 interview he said at first that nothing happened.

"I don't mean to sound like I'm wasting your time," he said. "It's hard being up here."

(CBS News contributed to this report.)

For full coverage of the Michael Jackson case, see [article id="1480530"]"Michael Jackson Accused."[/article]